Sudoku Tutorial
Naked vs Hidden
Whether its singles, doubles, triples, quads, etc, there is an important distinction
when dealing with naked vs hidden techniques.

Naked techniques remove candidates from OTHER cells.

Naked Double
nakeddouble2.jpg

Naked Triple
nakedtriple.jpg

Naked Quad
nakedquad4.jpg



But Hidden techniques remove candidates from the SAME cells.

Hidden Double
hp3.jpg

Hidden Triple
hiddentriple.jpg

Hidden Quad
hiddenQuad2.jpg

With hidden techniques, removing the eliminated candidates will convert the
HIDDEN (something) to a NAKED (something) but doing so will not cause any
further eliminations in that house.
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